Merge branch 'master' into black_holes_mergers

examples/EAGLE_ICs/EAGLE_12/eagle_12.yml

...LE_ICs/EAGLE_12/vrconfig_6dfofbound_subhalos_SO_hydro.cfg

examples/EAGLE_ICs/EAGLE_25/eagle_25.yml

...LE_ICs/EAGLE_25/vrconfig_6dfofbound_subhalos_SO_hydro.cfg

examples/EAGLE_ICs/EAGLE_50/eagle_50.yml

...LE_ICs/EAGLE_50/vrconfig_6dfofbound_subhalos_SO_hydro.cfg

examples/EAGLE_low_z/EAGLE_12/eagle_12.yml

examples/EAGLE_low_z/EAGLE_25/eagle_25.yml

examples/EAGLE_low_z/EAGLE_50/eagle_50.yml

examples/EAGLE_low_z/EAGLE_6/eagle_6.yml

examples/SubgridTests/BlackHoleSwallowing/swallowing.yml

examples/SubgridTests/BlackHoleSwallowing/swallowing_mpi.yml

src/black_holes/Default/black_holes_io.h

src/black_holes/EAGLE/black_holes_io.h

src/cell.c

src/part.c

src/runner.c

src/space.c

src/stars/Default/stars_io.h

src/stars/EAGLE/stars_io.h